1621255002 has 16 divisors (see below), whose sum is σ = 3250216992. Its totient is φ = 539133840.

The previous prime is 1621254983. The next prime is 1621255007. The reversal of 1621255002 is 2005521261.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1621255007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318388 + ... + 323439.

It is an arithmetic number, because the mean of its divisors is an integer number (203138562).

Almost surely, 2^1621255002 is an apocalyptic number.

1621255002 is an abundant number, since it is smaller than the sum of its proper divisors (1628961990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621255002 is a wasteful number, since it uses less digits than its factorization.

1621255002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642253.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1621255002 is about 40264.8109644141. The cubic root of 1621255002 is about 1174.7634959639.

Adding to 1621255002 its reverse (2005521261), we get a palindrome (3626776263).

The spelling of 1621255002 in words is "one billion, six hundred twenty-one million, two hundred fifty-five thousand, two".